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media: dvb: Add check on sp8870_readreg return

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The function sp8870_readreg returns a negative value when i2c_transfer
fails so properly check for this and return the error if it happens.

Cc: Sean Young <sean@mess.org>
Cc: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Alaa Emad <alaaemadhossney.ae@gmail.com>
Link: https://lore.kernel.org/r/20210503115736.2104747-60-gregkh@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alaa Emad 2021-05-03 13:57:26 +02:00 committed by Greg Kroah-Hartman
parent 47e4ff06fa
commit c6d822c56e
1 changed files with 3 additions and 1 deletions
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4
drivers/media/dvb-frontends/sp8870.c
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@ -280,7 +280,9 @@ static int sp8870_set_frontend_parameters(struct dvb_frontend *fe)
sp8870_writereg(state, 0xc05, reg0xc05);
// read status reg in order to clear pending irqs
sp8870_readreg(state, 0x200);
err = sp8870_readreg(state, 0x200);
if (err < 0)
return err;
// system controller start
sp8870_microcontroller_start(state);